The New Jersey Nets player is accusing his soon-to-be ex-wife of breaching fiduciary duty because she has not handed over financial records for the time that they were together.
"Kris feels that Kim hasn't given an honest and accurate accounting of money they made while they were married," a source told the gossip site. "Kris has complied with turning over his bank records, credit card statements, but Kim hasn't, and she has been stalling."
The source added, "Kris didn't want to take her to court over this, but he isn't playing Mr. Nice Guy anymore."
Kardashian, 31, and Humphries, 27, married Aug. 20 in a lavish ceremony that was broadcast on cable network E! and attracted more than 10 million viewers. The reality TV star announced she was filing for divorce less than three months later, citing "irreconcilable differences."
Humphries is seeking an annulment to the marriage instead of a divorce.